Siemens SINUMERIK 840D Operator's Manual page 149

A
03.04
Dimensions in metric
units and inches
Drive
DRF
Drift compensation
Dynamic feedforward
control
E
Editor
Electronic handwheel
Exact stop
Exact stop limit
External zero offset
 Siemens AG, 2004. All rights reserved.
SINUMERIK 840D/840Di/810D Operator's Guide Handheld Terminal 6 (BAH) - 03.04 Edition
Position and gradient values can be entered in the machining program
in inches. The control can be set to a basic system regardless of the
programmed measuring system (G70/G71).
• SINUMERIK FM-NC offers an analog +10V interface to the
SIMODRIVE 611A converter system.
• The SINUMERIK 840D control system is connected to the
SIMODRIVE 611D converter system by means of a high-speed
digital parallel bus.
Differential Resolver Function: An NC function, which generates an
incremental zero offset in automatic mode in conjunction with an
electronic handwheel.
During the constant traversing phase of the CNC axes an automatic
drift compensation is performed for the analog speed control.
(SINUMERIK FM-NC).
Inaccuracies in the contour caused by following errors can be almost
entirely eliminated with the aid of dynamic, acceleration-dependent
feedforward control. The result is extraordinary machining precision
even at high tool path feed-rates. The feedforward control can be
individually selected and deselected for each axis in the parts
program.
The editor is used to create, modify, add to, compress and insert
programs/texts/program blocks.
The electronic handwheels can be used to simultaneously traverse
selected axes manually. The meaning of the lines on the handwheels
is defined by increment weighting.
With a programmed exact stop instruction, the position stated in a
block is approached precisely and very slowly, if necessary. In order
to reduce the approach time, -> exact stop limits are defined for rapid
traverse and feed.
When all path axes reach their exact stop limits, the control responds
as if it had reached its destination point precisely. The -> part program
continues execution at the next block.
Zero offset specified by the -> PLC.
A
Appendix
B Terms
A-149